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5 posts
Logs, metrics and traces answer different questions. Wire them together with tracing and OpenTelemetry in a Rust service: one instrumentation API, a collector, context propagation across services and sensible sampling.
Logs leak more secrets than breaches: derived Debug, request headers, URLs, SQL parameters and error chains. Use secrecy, custom Debug, tracing skip and filters to stop it.
Tracing replaces log lines with spans and events: a span is a period of work, an event is a moment. Learn the macros, fields, instrument, subscribers and filters.
tracing adds spans and key-value fields to logs, works across async tasks and outputs JSON for log pipelines. Set up tracing-subscriber and instrument a handler.
Add structured logs and a request id to every Axum request with tower-http TraceLayer, SetRequestIdLayer and tracing spans that carry the id into your code.